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minix/drivers/tty/keyboard.c

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/* Keyboard driver for PC's and AT's.
*
* Changes:
* Jul 13, 2004 processes can observe function keys (Jorrit N. Herder)
* Jun 15, 2004 removed wreboot(), except panic dumps (Jorrit N. Herder)
* Feb 04, 1994 loadable keymaps (Marcus Hampel)
*/
#include "../drivers.h"
#include <termios.h>
#include <signal.h>
#include <unistd.h>
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/keymap.h>
#include "tty.h"
#include "keymaps/us-std.src"
#include "../../kernel/kernel.h"
#include "../../kernel/proc.h"
int irq_hook_id = -1;
/* Standard and AT keyboard. (PS/2 MCA implies AT throughout.) */
#define KEYBD 0x60 /* I/O port for keyboard data */
/* AT keyboard. */
#define KB_COMMAND 0x64 /* I/O port for commands on AT */
#define KB_STATUS 0x64 /* I/O port for status on AT */
#define KB_ACK 0xFA /* keyboard ack response */
#define KB_OUT_FULL 0x01 /* status bit set when keypress char pending */
#define KB_IN_FULL 0x02 /* status bit set when not ready to receive */
#define LED_CODE 0xED /* command to keyboard to set LEDs */
#define MAX_KB_ACK_RETRIES 0x1000 /* max #times to wait for kb ack */
#define MAX_KB_BUSY_RETRIES 0x1000 /* max #times to loop while kb busy */
#define KBIT 0x80 /* bit used to ack characters to keyboard */
/* Miscellaneous. */
#define ESC_SCAN 0x01 /* reboot key when panicking */
#define SLASH_SCAN 0x35 /* to recognize numeric slash */
#define RSHIFT_SCAN 0x36 /* to distinguish left and right shift */
#define HOME_SCAN 0x47 /* first key on the numeric keypad */
#define INS_SCAN 0x52 /* INS for use in CTRL-ALT-INS reboot */
#define DEL_SCAN 0x53 /* DEL for use in CTRL-ALT-DEL reboot */
#define CONSOLE 0 /* line number for console */
#define KB_IN_BYTES 32 /* size of keyboard input buffer */
PRIVATE char ibuf[KB_IN_BYTES]; /* input buffer */
PRIVATE char *ihead = ibuf; /* next free spot in input buffer */
PRIVATE char *itail = ibuf; /* scan code to return to TTY */
PRIVATE int icount; /* # codes in buffer */
PRIVATE int esc; /* escape scan code detected? */
PRIVATE int alt_l; /* left alt key state */
PRIVATE int alt_r; /* right alt key state */
PRIVATE int alt; /* either alt key */
PRIVATE int ctrl_l; /* left control key state */
PRIVATE int ctrl_r; /* right control key state */
PRIVATE int ctrl; /* either control key */
PRIVATE int shift_l; /* left shift key state */
PRIVATE int shift_r; /* right shift key state */
PRIVATE int shift; /* either shift key */
PRIVATE int num_down; /* num lock key depressed */
PRIVATE int caps_down; /* caps lock key depressed */
PRIVATE int scroll_down; /* scroll lock key depressed */
PRIVATE int locks[NR_CONS]; /* per console lock keys state */
/* Lock key active bits. Chosen to be equal to the keyboard LED bits. */
#define SCROLL_LOCK 0x01
#define NUM_LOCK 0x02
#define CAPS_LOCK 0x04
PRIVATE char numpad_map[] =
{'H', 'Y', 'A', 'B', 'D', 'C', 'V', 'U', 'G', 'S', 'T', '@'};
/* Variables and definition for observed function keys. */
PRIVATE int fkey_obs[12]; /* observers for F1-F12 */
PRIVATE int sfkey_obs[12]; /* observers for SHIFT F1-F12 */
FORWARD _PROTOTYPE( int kb_ack, (void) );
FORWARD _PROTOTYPE( int kb_wait, (void) );
FORWARD _PROTOTYPE( int func_key, (int scode) );
FORWARD _PROTOTYPE( int scan_keyboard, (void) );
FORWARD _PROTOTYPE( unsigned make_break, (int scode) );
FORWARD _PROTOTYPE( void set_leds, (void) );
FORWARD _PROTOTYPE( void kb_read, (struct tty *tp) );
FORWARD _PROTOTYPE( unsigned map_key, (int scode) );
/*===========================================================================*
* map_key0 *
*===========================================================================*/
/* Map a scan code to an ASCII code ignoring modifiers. */
#define map_key0(scode) \
((unsigned) keymap[(scode) * MAP_COLS])
/*===========================================================================*
* map_key *
*===========================================================================*/
PRIVATE unsigned map_key(scode)
int scode;
{
/* Map a scan code to an ASCII code. */
int caps, column, lk;
u16_t *keyrow;
if (scode == SLASH_SCAN && esc) return '/'; /* don't map numeric slash */
keyrow = &keymap[scode * MAP_COLS];
caps = shift;
lk = locks[ccurrent];
if ((lk & NUM_LOCK) && HOME_SCAN <= scode && scode <= DEL_SCAN) caps = !caps;
if ((lk & CAPS_LOCK) && (keyrow[0] & HASCAPS)) caps = !caps;
if (alt) {
column = 2;
if (ctrl || alt_r) column = 3; /* Ctrl + Alt == AltGr */
if (caps) column = 4;
} else {
column = 0;
if (caps) column = 1;
if (ctrl) column = 5;
}
return keyrow[column] & ~HASCAPS;
}
/*===========================================================================*
* kbd_hw_int *
*===========================================================================*/
PUBLIC void do_interrupt(m_ptr)
message *m_ptr;
{
/* A keyboard interrupt has occurred. Process it. */
int scode;
static timer_t timer; /* timer must be static! */
/* Fetch the character from the keyboard hardware and acknowledge it. */
scode = scan_keyboard();
/* Store the scancode in memory so the task can get at it later. */
if (icount < KB_IN_BYTES) {
*ihead++ = scode;
if (ihead == ibuf + KB_IN_BYTES) ihead = ibuf;
icount++;
tty_table[ccurrent].tty_events = 1;
}
}
/*==========================================================================*
* kb_read *
*==========================================================================*/
PRIVATE void kb_read(tp)
tty_t *tp;
{
/* Process characters from the circular keyboard buffer. */
char buf[3];
int scode;
unsigned ch;
tp = &tty_table[ccurrent]; /* always use the current console */
while (icount > 0) {
scode = *itail++; /* take one key scan code */
if (itail == ibuf + KB_IN_BYTES) itail = ibuf;
icount--;
/* Function keys are being used for debug dumps. */
if (func_key(scode)) continue;
/* Perform make/break processing. */
ch = make_break(scode);
if (ch <= 0xFF) {
/* A normal character. */
buf[0] = ch;
(void) in_process(tp, buf, 1);
} else
if (HOME <= ch && ch <= INSRT) {
/* An ASCII escape sequence generated by the numeric pad. */
buf[0] = ESC;
buf[1] = '[';
buf[2] = numpad_map[ch - HOME];
(void) in_process(tp, buf, 3);
} else
if (ch == ALEFT) {
/* Choose lower numbered console as current console. */
select_console(ccurrent - 1);
set_leds();
} else
if (ch == ARIGHT) {
/* Choose higher numbered console as current console. */
select_console(ccurrent + 1);
set_leds();
} else
if (AF1 <= ch && ch <= AF12) {
/* Alt-F1 is console, Alt-F2 is ttyc1, etc. */
select_console(ch - AF1);
set_leds();
} else
if (CF1 <= ch && ch <= CF12) {
switch(ch) {
case CF3: toggle_scroll(); break; /* hardware <-> software */
case CF7: sigchar(&tty_table[CONSOLE], SIGQUIT); break;
case CF8: sigchar(&tty_table[CONSOLE], SIGINT); break;
case CF9: sigchar(&tty_table[CONSOLE], SIGKILL); break;
}
}
}
}
/*===========================================================================*
* make_break *
*===========================================================================*/
PRIVATE unsigned make_break(scode)
int scode; /* scan code of key just struck or released */
{
/* This routine can handle keyboards that interrupt only on key depression,
* as well as keyboards that interrupt on key depression and key release.
* For efficiency, the interrupt routine filters out most key releases.
*/
int ch, make, escape;
static int CAD_count = 0;
/* Check for CTRL-ALT-DEL, and if found, halt the computer. This would
* be better done in keyboard() in case TTY is hung, except control and
* alt are set in the high level code.
*/
if (ctrl && alt && (scode == DEL_SCAN || scode == INS_SCAN))
{
if (++CAD_count == 3) sys_abort(RBT_HALT);
sys_kill(INIT_PROC_NR, SIGABRT);
return -1;
}
/* High-order bit set on key release. */
make = (scode & KEY_RELEASE) == 0; /* true if pressed */
ch = map_key(scode &= ASCII_MASK); /* map to ASCII */
escape = esc; /* Key is escaped? (true if added since the XT) */
esc = 0;
switch (ch) {
case CTRL: /* Left or right control key */
*(escape ? &ctrl_r : &ctrl_l) = make;
ctrl = ctrl_l | ctrl_r;
break;
case SHIFT: /* Left or right shift key */
*(scode == RSHIFT_SCAN ? &shift_r : &shift_l) = make;
shift = shift_l | shift_r;
break;
case ALT: /* Left or right alt key */
*(escape ? &alt_r : &alt_l) = make;
alt = alt_l | alt_r;
break;
case CALOCK: /* Caps lock - toggle on 0 -> 1 transition */
if (caps_down < make) {
locks[ccurrent] ^= CAPS_LOCK;
set_leds();
}
caps_down = make;
break;
case NLOCK: /* Num lock */
if (num_down < make) {
locks[ccurrent] ^= NUM_LOCK;
set_leds();
}
num_down = make;
break;
case SLOCK: /* Scroll lock */
if (scroll_down < make) {
locks[ccurrent] ^= SCROLL_LOCK;
set_leds();
}
scroll_down = make;
break;
case EXTKEY: /* Escape keycode */
esc = 1; /* Next key is escaped */
return(-1);
default: /* A normal key */
if (make) return(ch);
}
/* Key release, or a shift type key. */
return(-1);
}
/*===========================================================================*
* set_leds *
*===========================================================================*/
PRIVATE void set_leds()
{
/* Set the LEDs on the caps, num, and scroll lock keys */
int s;
if (! machine.pc_at) return; /* PC/XT doesn't have LEDs */
kb_wait(); /* wait for buffer empty */
if ((s=sys_outb(KEYBD, LED_CODE)) != OK)
printf("Warning, sys_outb couldn't prepare for LED values: %d\n", s);
/* prepare keyboard to accept LED values */
kb_ack(); /* wait for ack response */
kb_wait(); /* wait for buffer empty */
if ((s=sys_outb(KEYBD, locks[ccurrent])) != OK)
printf("Warning, sys_outb couldn't give LED values: %d\n", s);
/* give keyboard LED values */
kb_ack(); /* wait for ack response */
}
/*==========================================================================*
* kb_wait *
*==========================================================================*/
PRIVATE int kb_wait()
{
/* Wait until the controller is ready; return zero if this times out. */
int retries, status, temp;
int s;
retries = MAX_KB_BUSY_RETRIES + 1; /* wait until not busy */
do {
s = sys_inb(KB_STATUS, &status);
if (status & KB_OUT_FULL) {
s = sys_inb(KEYBD, &temp); /* discard value */
}
if (! (status & (KB_IN_FULL|KB_OUT_FULL)) )
break; /* wait until ready */
} while (--retries != 0); /* continue unless timeout */
return(retries); /* zero on timeout, positive if ready */
}
/*==========================================================================*
* kb_ack *
*==========================================================================*/
PRIVATE int kb_ack()
{
/* Wait until kbd acknowledges last command; return zero if this times out. */
int retries, s;
u8_t u8val;
retries = MAX_KB_ACK_RETRIES + 1;
do {
s = sys_inb(KEYBD, &u8val);
if (u8val == KB_ACK)
break; /* wait for ack */
} while(--retries != 0); /* continue unless timeout */
return(retries); /* nonzero if ack received */
}
/*===========================================================================*
* kb_init *
*===========================================================================*/
PUBLIC void kb_init(tp)
tty_t *tp;
{
/* Initialize the keyboard driver. */
static int count = 0;
int i;
tp->tty_devread = kb_read; /* input function */
set_leds(); /* turn off numlock led */
scan_keyboard(); /* discard leftover keystroke */
/* The following initialization should only run once. */
if (! count ++) {
/* Clear the function key observers array. Also see func_key(). */
for (i=0; i<12; i++) {
fkey_obs[i] = NONE; /* F1-F12 observers */
sfkey_obs[i] = NONE; /* Shift F1-F12 observers */
}
/* Set interrupt handler and enable keyboard IRQ. */
if ((i=sys_irqsetpolicy(KEYBOARD_IRQ, IRQ_REENABLE, &irq_hook_id)) != OK)
server_panic("TTY", "Couldn't set keyboard IRQ policy", i);
if ((i=sys_irqenable(&irq_hook_id)) != OK)
server_panic("TTY", "Couldn't enable keyboard IRQs", i);
}
}
/*===========================================================================*
* kbd_loadmap *
*===========================================================================*/
PUBLIC int kbd_loadmap(m)
message *m;
{
/* Load a new keymap. */
int result;
result = sys_vircopy(m->PROC_NR, D, (vir_bytes) m->ADDRESS,
SELF, D, (vir_bytes) keymap,
(vir_bytes) sizeof(keymap));
return(result);
}
/*===========================================================================*
* do_fkey_ctl *
*===========================================================================*/
PUBLIC void do_fkey_ctl(m_ptr)
message *m_ptr; /* pointer to the request message */
{
/* This procedure allows processes to register a function key to receive
* notifications if it is pressed. At most one binding per key can exist.
*/
int fkey = m_ptr->FKEY_CODE; /* get function key code */
unsigned code;
int *observers = NULL;
int index = -1;
int result;
/* See if this key can be observed; get the observers array and index. */
if (SF1 == fkey) result = EINVAL; /* Shift-F1 is TTY reserved */
if (F1 <= fkey && fkey <= F12) { /* F1-F12 */
observers = fkey_obs;
index = fkey - F1;
} else if (SF2 <= fkey && fkey <= SF12) { /* Shift F1-F12 */
observers = sfkey_obs;
index = fkey - SF1;
}
/* Handle the request if an observers array was set above. */
if (observers) {
if (m_ptr->FKEY_ENABLE) { /* try to register an observer */
if (observers[index] == NONE) {
observers[index] = m_ptr->m_source;
result = OK; /* done, new observer registered */
} else {
result = EBUSY; /* function key already bound */
}
} else { /* unregister an observer */
if (observers[index] == m_ptr->m_source) {
observers[index] = NONE;
result = OK; /* done, observer unregistered */
} else {
result = EPERM; /* can only remove own binding */
}
}
} else {
result = EINVAL; /* key cannot be observed */
}
/* Almost done, return result to caller. */
m_ptr->m_type = result;
send(m_ptr->m_source, m_ptr);
}
/*===========================================================================*
* func_key *
*===========================================================================*/
PRIVATE int func_key(scode)
int scode; /* scan code for a function key */
{
/* This procedure traps function keys for debugging purposes. Observers of
* function keys are kept in a global array. If a subject (a key) is pressed
* the observer is notified of the event. Initialization of the arrays is done
* in kb_init, where NONE is set to indicate there is no interest in the key.
* Returns FALSE on a key release or if the key is not observable.
*/
message m;
int *observers = NULL;
unsigned fkey;
int index = -1;
int i,s;
struct proc proc;
/* Ignore key releases. If this is a key press, get full key code. */
if (scode & KEY_RELEASE) return(FALSE); /* key release */
fkey = map_key(scode); /* include modifiers */
/* Key pressed, now see if there is an observer for the pressed key.
* F1-F12 observers are in fkey_obs array.
* SHIFT F1-F12 observers are in sfkey_req array.
* CTRL F1-F12 reserved (see kb_read)
* ALT F1-F12 reserved (see kb_read)
* Other combinations are not in use. Note that Alt+Shift+F1-F12 is yet
* defined in <minix/keymap.h>, but other modifier combinations are not.
*/
if (SF1 == fkey) {
printf("\n");
printf("System information. Known function key mappings to request debug dumps:\n");
printf("-------------------------------------------------------------------------\n");
for (i=0; i<12; i++) {
printf(" %sF%d: ", i+1<10? " ":"", i+1);
if (fkey_obs[i] != NONE) {
if ((s=sys_getproc(&proc, fkey_obs[i]))!=OK)
printf("sys_getproc: %d\n", s);
printf("%-14.14s", proc.p_name);
} else {
printf("%-14.14s", "<none>");
}
printf(" %sShift-F%d: ", i+1<10? " ":"", i+1);
if (sfkey_obs[i] != NONE) {
if ((s=sys_getproc(&proc, sfkey_obs[i]))!=OK)
printf("sys_getproc: %d\n", s);
printf("%-14.14s", proc.p_name);
} else {
printf("%-14.14s", "<none>");
}
printf("\n");
}
printf("\n");
printf("Press one of the registered function keys to trigger a debug dump.\n");
printf("\n");
}
else if (F1 <= fkey && fkey <= F12) { /* F1-F12 */
observers = &fkey_obs[0];
index = fkey - F1;
} else if (SF2 <= fkey && fkey <= SF12) { /* Shift F2-F12 */
observers = &sfkey_obs[0];
index = fkey - SF1;
}
if (! observers) return(FALSE); /* not observable */
/* See if an observer is registered and send it a message. */
if (observers[index] != NONE) {
m.m_type = FKEY_PRESSED;
m.FKEY_NUM = index+1;
m.FKEY_CODE = fkey;
if (OK != (s=nb_send(observers[index], &m))) {
printf("WARNING: F%d key notification to process %d failed: %d.\n",
index+1, observers[index], s);
}
}
return(TRUE);
}
/*==========================================================================*
* scan_keyboard *
*==========================================================================*/
PRIVATE int scan_keyboard()
{
/* Fetch the character from the keyboard hardware and acknowledge it. */
pvb_pair_t byte_in[2], byte_out[2];
byte_in[0].port = KEYBD; /* get the scan code for the key struck */
byte_in[1].port = PORT_B; /* strobe the keyboard to ack the char */
sys_vinb(byte_in, 2); /* request actual input */
pv_set(byte_out[0], PORT_B, byte_in[1].value | KBIT); /* strobe bit high */
pv_set(byte_out[1], PORT_B, byte_in[1].value); /* then strobe low */
sys_voutb(byte_out, 2); /* request actual output */
return(byte_in[0].value); /* return scan code */
}
/*==========================================================================*
* do_panic_dumps *
*==========================================================================*/
PUBLIC void do_panic_dumps(m)
message *m; /* request message to TTY */
{
/* Wait for keystrokes for printing debugging info and reboot. */
int quiet, code;
/* A panic! Allow debug dumps until user wants to shutdown. */
printf("\nHit ESC to reboot, DEL to shutdown, F-keys for debug dumps\n");
(void) scan_keyboard(); /* ack any old input */
quiet = scan_keyboard();/* quiescent value (0 on PC, last code on AT)*/
for (;;) {
tick_delay(10);
/* See if there are pending request for output, but don't block.
* Diagnostics can span multiple printf()s, so do it in a loop.
*/
while (nb_receive(ANY, m) == OK) {
switch(m->m_type) {
case NEW_KMESS: do_new_kmess(m); break;
case DIAGNOSTICS: do_diagnostics(m); break;
default: ; /* do nothing */
}
tick_delay(1); /* allow more */
}
code = scan_keyboard();
if (code != quiet) {
/* A key has been pressed. */
switch (code) { /* possibly abort MINIX */
case ESC_SCAN: sys_abort(RBT_REBOOT); return;
case DEL_SCAN: sys_abort(RBT_HALT); return;
}
(void) func_key(code); /* check for function key */
quiet = scan_keyboard();
}
}
}
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